CD4538BCM Equivalent & Substitute Parts

Part Overview

The CD4538BCM is a monostable multivibrator logic IC manufactured by onsemi, housed in a 16-SOIC package with 100 ns propagation delay. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The CD4538BCM belongs to the 4000B logic series and operates across a 3 V to 15 V supply range with dual independent circuits.

Key Parameters

Parameter	CD4538BCM
Manufacturer	onsemi
Logic Type	Monostable Multivibrator
Independent Circuits	2
Propagation Delay	100 ns
Current - Output High, Low	8.8 mA, 8.8 mA
Voltage - Supply	3 V ~ 15 V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the CD4538BCM is determined by the following critical parameters: logic type (monostable multivibrator), independent circuits (2), package type (16-SOIC with 0.154" width), mounting type (surface mount), operating temperature range (-55°C ~ 125°C), and supply voltage compatibility (3 V ~ 15 V minimum). Propagation delay tolerance and output current specifications define secondary compatibility levels. Parts are grouped into three categories based on these criteria:

Category 1 - Direct Functional Equivalents (Active Status): Parts maintaining identical or superior electrical specifications with active product status.

Category 2 - Functional Equivalents with Enhanced Specifications: Parts with improved performance characteristics (faster propagation delay, extended supply voltage range) and active status.

Category 3 - Compatible Alternatives with Operational Constraints: Parts with compatible core functionality but different package dimensions or discontinued status.

Parameter Comparison

Part Number	Manufacturer	Propagation Delay	Output Current (High/Low)	Supply Voltage	Schmitt Trigger Input	Package / Case	Product Status	RoHS Status
CD4538BCM	onsemi	100 ns	8.8 mA / 8.8 mA	3 V ~ 15 V	No	16-SOIC (0.154", 3.90mm)	Obsolete	Not Specified
MC14538BDG	onsemi	95 ns	8.8 mA / 8.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant
MC14538BDR2G	onsemi	95 ns	8.8 mA / 8.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant
NLV14538BDR2G	onsemi	95 ns	8.8 mA / 8.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant
CD14538BM	Texas Instruments	100 ns	6.8 mA / 6.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
CD14538BM96	Texas Instruments	100 ns	6.8 mA / 6.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant
CD14538BMT	Texas Instruments	100 ns	6.8 mA / 6.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.154", 3.90mm)	Discontinued at DiGi Electronics	ROHS3 Compliant
CD14538BNSR	Texas Instruments	100 ns	6.8 mA / 6.8 mA	3 V ~ 18 V	Yes	16-SOIC (0.209", 5.30mm)	Active	ROHS3 Compliant
HEF4538BT,653	Nexperia USA Inc.	40 ns	3.4 mA / 3.4 mA	3 V ~ 15 V	No	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant
HEF4538BT-Q100J	Nexperia USA Inc.	40 ns	3.4 mA / 3.4 mA	3 V ~ 15 V	No	16-SOIC (0.154", 3.90mm)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

MC14538BDG and MC14538BDR2G are the preferred direct substitutes. Both maintain identical package dimensions (16-SOIC, 0.154" width), dual independent circuits, and equivalent output current specifications. These parts offer improved propagation delay (95 ns versus 100 ns) and extended supply voltage range (3 V ~ 18 V). Both are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Functional Equivalents):

CD14538BM96 and CD14538BMT from Texas Instruments provide matching propagation delay (100 ns) and package dimensions. CD14538BM96 is currently active with high inventory availability (105,100 pcs). Both feature Schmitt trigger inputs and ROHS3 compliance. CD14538BMT is discontinued at DiGi Electronics but maintains substantial inventory (133,853 pcs).

Automotive-Grade Alternative:

NLV14538BDR2G is qualified to AEC-Q100 automotive standards with identical electrical specifications to MC14538BDR2G. This part is suitable for applications requiring automotive-grade components.

Performance-Enhanced Alternative:

HEF4538BT,653 and HEF4538BT-Q100J from Nexperia offer significantly faster propagation delay (40 ns) and lower output current (3.4 mA). These parts maintain the 16-SOIC package and 3 V ~ 15 V supply range. HEF4538BT-Q100J includes AEC-Q100 qualification. Use these parts only when faster switching performance is acceptable and lower output current meets circuit requirements.

Package Variant:

CD14538BNSR uses a wider 16-SO package (0.209" width) versus the standard 0.154" width. This part is suitable only if PCB layout accommodates the larger package footprint.

Frequently Asked Questions (FAQ)

Q: Can MC14538BDG directly replace CD4538BCM without circuit modifications?

A: Yes. MC14538BDG maintains identical package dimensions, dual independent circuits, and equivalent output current. The improved propagation delay (95 ns versus 100 ns) and extended supply voltage range (3 V ~ 18 V) provide enhanced performance without requiring design changes.

Q: What is the difference between MC14538BDR2G and MC14538BDG?

A: Both parts are electrically identical. MC14538BDR2G is supplied in Cut Tape & Digi-Reel packaging with higher inventory (15,306 pcs), while MC14538BDG is supplied in Tube packaging (3,600 pcs). Selection depends on assembly process requirements.

Q: Can HEF4538BT,653 replace CD4538BCM?

A: HEF4538BT,653 is functionally compatible but with operational differences. It offers faster propagation delay (40 ns) and lower output current (3.4 mA versus 8.8 mA). Use this part only if circuit design accommodates reduced output drive capability and faster switching characteristics.

Q: Is CD14538BNSR compatible with CD4538BCM?

A: CD14538BNSR is electrically compatible but uses a wider 16-SO package (0.209" width) compared to the standard 16-SOIC (0.154" width). This part is suitable only if PCB footprint and assembly equipment support the larger package.

Q: Which substitute offers the best long-term availability?

A: CD14538BM96 from Texas Instruments is the recommended choice for long-term availability. It is currently active with the highest inventory level (105,100 pcs) and maintains identical propagation delay and package specifications to CD4538BCM.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original CD4538BCM does not specify RoHS status. All recommended substitutes meet current environmental and regulatory requirements.

Q: What is the significance of Schmitt trigger input in these parts?

A: CD4538BCM does not include Schmitt trigger input. Most substitute parts (MC14538, CD14538, NLV14538 series) include Schmitt trigger inputs, which provide improved noise immunity. HEF4538 parts do not include Schmitt trigger inputs. This difference does not prevent substitution but may affect circuit noise performance.

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